Sitemap
A sitemap is a file where you provide information about the pages, videos, and other files on your site, and the relationships between them.
If your site's pages are properly linked, Google can usually discover most of your site. Even so, a sitemap can improve the crawling of larger or more complex sites, or more specialized files.
developers.google.com/search/docs/advanced/sitemaps/build-sitemap
www.sitemaps.org/protocol.html
Also, all URLs in a Sitemap must be from a single host, such as www.example.com or store.example.com.
example.com/catalog/sitemap.xml
Sitemap file location
The location of a Sitemap file determines the set of URLs that can be included in that Sitemap. A Sitemap file located at http://example.com/catalog/sitemap.xml can include any URLs starting with http://example.com/catalog/ but can not include URLs starting with http://example.com/images/.
If you have the permission to change http://example.org/path/sitemap.xml, it is assumed that you also have permission to provide information for URLs with the prefix http://example.org/path/. Examples of URLs considered valid in http://example.com/catalog/sitemap.xml include: